Ok. But i don't use sdcard or usb drive. I have it directly in internal 16MB flash. Will try to get a console attached.
EDIT: serial uart attached. If i set baud to 115200, i get no output until openwrt boots:
[ 0.000000] Linux version 6.6.73 (builder@buildhost) (mipsel-openwrt-linux-musl-gcc (OpenWrt GCC 13.3.0 r28427-6df0e3d02a) 13.3.0, GNU ld (GNU Binutils) 2.42) #0 SMP Mon Feb 3 23:09:37 2025
[ 0.000000] SoC Type: MediaTek MT7621 ver:1 eco:4
[ 0.000000] printk: bootconsole [early0] enabled
[ 0.000000] CPU0 revision is: 0001992f (MIPS 1004Kc)
[ 0.000000] MIPS: machine is MikroTik RouterBOARD 760iGS (hEX S)
[ 0.000000] Initrd not found or empty - disabling initrd
[ 0.000000] VPE topology {2,2} total 4
[ 0.000000] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[ 0.000000] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[ 0.000000] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[ 0.000000] Zone ranges:
[ 0.000000] Normal [mem 0x0000000000000000-0x000000000fffffff]
[ 0.000000] Movable zone start for each node
[ 0.000000] Early memory node ranges
[ 0.000000] node 0: [mem 0x0000000000000000-0x000000000fffffff]
[ 0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x000000000fffffff]
[ 0.000000] percpu: Embedded 12 pages/cpu s19136 r8192 d21824 u49152
[ 0.000000] Kernel command line: console=ttyS0,115200 rootfstype=squashfs,jffs2
[ 0.000000] Dentry cache hash table entries: 32768 (order: 5, 131072 bytes, linear)
[ 0.000000] Inode-cache hash table entries: 16384 (order: 4, 65536 bytes, linear)
[ 0.000000] Writing ErrCtl register=0004816f
[ 0.000000] Readback ErrCtl register=0004816f
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 64960
[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[ 0.000000] Memory: 247816K/262144K available (8363K kernel code, 653K rwdata, 1016K rodata, 1284K init, 229K bss, 14328K reserved, 0K cma-reserved)
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[ 0.000000] rcu: Hierarchical RCU implementation.
[ 0.000000] Tracing variant of Tasks RCU enabled.
[ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
[ 0.000000] NR_IRQS: 256
[ 0.000000] rcu: srcu_init: Setting srcu_struct sizes based on contention.
[ 0.000000] clocksource: GIC: mask: 0xffffffffffffffff max_cycles: 0xcaf478abb4, max_idle_ns: 440795247997 ns
[ 0.000004] sched_clock: 64 bits at 880MHz, resolution 1ns, wraps every 4398046511103ns
[ 0.008073] Calibrating delay loop... 586.13 BogoMIPS (lpj=2930688)
[ 0.066230] pid_max: default: 32768 minimum: 301
[ 0.079695] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.086935] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes, linear)
[ 0.103577] RCU Tasks Trace: Setting shift to 2 and lim to 1 rcu_task_cb_adjust=1 rcu_task_cpu_ids=4.
[ 0.113405] rcu: Hierarchical SRCU implementation.
[ 0.118105] rcu: Max phase no-delay instances is 1000.
[ 0.124167] smp: Bringing up secondary CPUs ...
[ 0.129558] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[ 0.129585] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[ 0.129600] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[ 0.129649] CPU1 revision is: 0001992f (MIPS 1004Kc)
[ 0.183618] Synchronize counters for CPU 1: done.
[ 0.216213] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[ 0.216238] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[ 0.216251] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[ 0.216280] CPU2 revision is: 0001992f (MIPS 1004Kc)
[ 0.275182] Synchronize counters for CPU 2: done.
[ 0.305861] Primary instruction cache 32kB, VIPT, 4-way, linesize 32 bytes.
[ 0.305883] Primary data cache 32kB, 4-way, PIPT, no aliases, linesize 32 bytes
[ 0.305897] MIPS secondary cache 256kB, 8-way, linesize 32 bytes.
[ 0.305931] CPU3 revision is: 0001992f (MIPS 1004Kc)
[ 0.360379] Synchronize counters for CPU 3: done.
[ 0.390242] smp: Brought up 1 node, 4 CPUs
[ 0.401375] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.411189] futex hash table entries: 1024 (order: 3, 32768 bytes, linear)
[ 0.422002] pinctrl core: initialized pinctrl subsystem
[ 0.430413] NET: Registered PF_NETLINK/PF_ROUTE protocol family
[ 0.437129] thermal_sys: Registered thermal governor 'step_wise'
[ 0.439395] /pinctrl: Fixed dependency cycle(s) with /pinctrl/pinctrl0
[ 0.467962] clocksource: Switched to clocksource GIC
[ 0.483195] NET: Registered PF_INET protocol family
[ 0.488366] IP idents hash table entries: 4096 (order: 3, 32768 bytes, linear)
[ 0.497378] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 4096 bytes, linear)
[ 0.505702] Table-perturb hash table entries: 65536 (order: 6, 262144 bytes, linear)
[ 0.513382] TCP established hash table entries: 2048 (order: 1, 8192 bytes, linear)
[ 0.521004] TCP bind hash table entries: 2048 (order: 3, 32768 bytes, linear)
[ 0.528221] TCP: Hash tables configured (established 2048 bind 2048)
[ 0.535490] MPTCP token hash table entries: 256 (order: 0, 4096 bytes, linear)
[ 0.543020] UDP hash table entries: 256 (order: 1, 8192 bytes, linear)
[ 0.549521] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes, linear)
[ 0.557378] NET: Registered PF_UNIX/PF_LOCAL protocol family
[ 0.563065] PCI: CLS 0 bytes, default 32
[ 0.570802] workingset: timestamp_bits=14 max_order=16 bucket_order=2
[ 0.578544] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 0.584289] jffs2: version 2.2 (NAND) (SUMMARY) (LZMA) (RTIME) (CMODE_PRIORITY) (c) 2001-2006 Red Hat, Inc.
[ 0.600325] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 251)
[ 0.611294] mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 0.617254] mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 0.623328] mt7621_gpio 1e000600.gpio: registering 32 gpios
[ 0.630091] Serial: 8250/16550 driver, 16 ports, IRQ sharing enabled
[ 0.646224] printk: console [ttyS0] disabled
[ 0.651384] 1e000c00.uartlite: ttyS0 at MMIO 0x1e000c00 (irq = 18, base_baud = 3125000) is a 16550A
[ 0.660469] printk: console [ttyS0] enabled
[ 0.660469] printk: console [ttyS0] enabled
[ 0.668756] printk: bootconsole [early0] disabled
[ 0.668756] printk: bootconsole [early0] disabled
[ 0.682371] spi-mt7621 1e000b00.spi: sys_freq: 220000000
[ 0.689415] spi-nor spi0.0: w25q128jv (16384 Kbytes)
[ 0.694507] 2 fixed-partitions partitions found on MTD device spi0.0
[ 0.700918] OF: Bad cell count for /palmbus@1e000000/spi@b00/flash@0/partitions
[ 0.708261] OF: Bad cell count for /palmbus@1e000000/spi@b00/flash@0/partitions
[ 0.715919] OF: Bad cell count for /palmbus@1e000000/spi@b00/flash@0/partitions
[ 0.723276] OF: Bad cell count for /palmbus@1e000000/spi@b00/flash@0/partitions
[ 0.730876] Creating 2 MTD partitions on "spi0.0":
[ 0.735676] 0x000000000000-0x000000040000 : "RouterBoot"
[ 0.743591] 5 routerbootpart partitions found on MTD device RouterBoot
[ 0.750169] Creating 5 MTD partitions on "RouterBoot":
[ 0.755296] 0x000000000000-0x00000000f000 : "bootloader1"
[ 0.761977] 0x00000000f000-0x000000010000 : "hard_config"
[ 0.767869] OF: Bad cell count for /palmbus@1e000000/spi@b00/flash@0/partitions
[ 0.776337] 0x000000010000-0x00000001f000 : "bootloader2"
[ 0.782961] 0x000000020000-0x000000021000 : "soft_config"
[ 0.789915] 0x000000030000-0x000000031000 : "bios"
[ 0.795935] 0x000000040000-0x000001000000 : "firmware"
[ 0.802883] 2 minor-fw partitions found on MTD device firmware
[ 0.808768] Creating 2 MTD partitions on "firmware":
[ 0.813721] 0x000000000000-0x000000330000 : "kernel"
[ 0.820112] 0x000000330000-0x000000fc0000 : "rootfs"
[ 0.826179] mtd: setting mtd8 (rootfs) as root device
[ 0.831383] 1 squashfs-split partitions found on MTD device rootfs
[ 0.837557] 0x000000bc0000-0x000000fc0000 : "rootfs_data"
[ 0.980164] i2c_dev: i2c /dev entries driver
[ 0.985359] i2c-mt7621 1e000900.i2c: clock 100 kHz
[ 0.993566] MikroTik RouterBOARD hardware configuration sysfs driver v0.08
[ 1.001946] MikroTik RouterBOARD software configuration sysfs driver v0.05
[ 1.013330] NET: Registered PF_INET6 protocol family
[ 1.020954] Segment Routing with IPv6
[ 1.024707] In-situ OAM (IOAM) with IPv6
[ 1.028812] NET: Registered PF_PACKET protocol family
[ 1.033913] bridge: filtering via arp/ip/ip6tables is no longer available by default. Update your scripts to load br_netfilter if you need this.
[ 1.047353] 8021q: 802.1Q VLAN Support v1.8
[ 1.082403] gpio-export gpio_export: 1 gpio(s) exported
[ 1.229620] mtk_soc_eth 1e100000.ethernet: generated random MAC address 65:74:68:25:64:00
[ 1.239961] mt7530-mdio mdio-bus:1f: MT7530 adapts as multi-chip module
[ 1.258310] mtk_soc_eth 1e100000.ethernet eth0: mediatek frame engine at 0xbe100000, irq 19
[ 1.270400] mtk_soc_eth 1e100000.ethernet eth1: mediatek frame engine at 0xbe100000, irq 19
[ 1.280039] mt7530-mdio mdio-bus:1f: MT7530 adapts as multi-chip module
[ 1.313223] mt7530-mdio mdio-bus:1f: configuring for fixed/rgmii link mode
[ 1.321630] mt7530-mdio mdio-bus:1f wan (uninitialized): PHY [mt7530-0:00] driver [MediaTek MT7530 PHY] (irq=22)
[ 1.334502] mt7530-mdio mdio-bus:1f: Link is Up - 1Gbps/Full - flow control rx/tx
[ 1.338917] mt7530-mdio mdio-bus:1f lan2 (uninitialized): PHY [mt7530-0:01] driver [MediaTek MT7530 PHY] (irq=23)
[ 1.355091] mt7530-mdio mdio-bus:1f lan3 (uninitialized): PHY [mt7530-0:02] driver [MediaTek MT7530 PHY] (irq=24)
[ 1.368459] mt7530-mdio mdio-bus:1f lan4 (uninitialized): PHY [mt7530-0:03] driver [MediaTek MT7530 PHY] (irq=25)
[ 1.381600] mt7530-mdio mdio-bus:1f lan5 (uninitialized): PHY [mt7530-0:04] driver [MediaTek MT7530 PHY] (irq=26)
[ 1.394193] mtk_soc_eth 1e100000.ethernet eth0: entered promiscuous mode
[ 1.401084] DSA: tree 0 setup
[ 1.405174] clk: Disabling unused clocks
[ 1.415905] VFS: Mounted root (squashfs filesystem) readonly on device 31:8.
[ 1.426912] Freeing unused kernel image (initmem) memory: 1284K
[ 1.432897] This architecture does not have kernel memory protection.
[ 1.439346] Run /sbin/init as init process
[ 1.969771] init: Console is alive
[ 1.973459] init: - watchdog -
[ 2.523516] kmodloader: loading kernel modules from /etc/modules-boot.d/*
[ 2.596715] usbcore: registered new interface driver usbfs
[ 2.602535] usbcore: registered new interface driver hub
[ 2.608143] usbcore: registered new device driver usb
[ 2.614908] gpio_button_hotplug: loading out-of-tree module taints kernel.
[ 2.633161] xhci-mtk 1e1c0000.xhci: supply vusb33 not found, using dummy regulator
[ 2.641581] xhci-mtk 1e1c0000.xhci: xHCI Host Controller
[ 2.646954] xhci-mtk 1e1c0000.xhci: new USB bus registered, assigned bus number 1
[ 2.659646] xhci-mtk 1e1c0000.xhci: hcc params 0x01401198 hci version 0x96 quirks 0x0000000000280010
[ 2.668893] xhci-mtk 1e1c0000.xhci: irq 29, io mem 0x1e1c0000
[ 2.674927] xhci-mtk 1e1c0000.xhci: xHCI Host Controller
[ 2.680276] xhci-mtk 1e1c0000.xhci: new USB bus registered, assigned bus number 2
[ 2.687746] xhci-mtk 1e1c0000.xhci: Host supports USB 3.0 SuperSpeed
[ 2.695359] hub 1-0:1.0: USB hub found
[ 2.699294] hub 1-0:1.0: 2 ports detected
[ 2.704607] usb usb2: We don't know the algorithms for LPM for this host, disabling LPM.
[ 2.713926] hub 2-0:1.0: USB hub found
[ 2.717825] hub 2-0:1.0: 1 port detected
[ 2.731103] kmodloader: done loading kernel modules from /etc/modules-boot.d/*
[ 2.747053] init: - preinit -
[ 3.448298] mtk_soc_eth 1e100000.ethernet sfp: renamed from eth1
[ 4.877972] random: crng init done
[ 5.385716] mtk_soc_eth 1e100000.ethernet eth0: configuring for fixed/rgmii link mode
[ 5.398363] mtk_soc_eth 1e100000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 5.398745] mt7530-mdio mdio-bus:1f lan2: configuring for phy/gmii link mode
Press the [f] key and hit [enter] to enter failsafe mode
Press the [1], [2], [3] or [4] key and hit [enter] to select the debug level
[ 9.921495] jffs2: notice: (620) jffs2_build_xattr_subsystem: complete building xattr subsystem, 19 of xdatum (0 unchecked, 4 orphan) and 23 of xref (5 dead, 0 orphan) found.
[ 9.939077] mount_root: switching to jffs2 overlay
[ 9.946937] overlayfs: upper fs does not support tmpfile.
[ 9.964597] urandom-seed: Seeding with /etc/urandom.seed
[ 10.074981] procd: - early -
[ 10.078200] procd: - watchdog -
[ 10.712599] procd: - watchdog -
[ 10.716982] procd: - ubus -
[ 10.875794] procd: - init -
Please press Enter to activate this console.
[ 11.755440] kmodloader: loading kernel modules from /etc/modules.d/*
[ 11.823796] mtk-eip93 1e004000.crypto: EIP93 Crypto Engine Initialized.
[ 11.866676] sfp sfp1: Host maximum power 1.0W
[ 11.921043] PPP generic driver version 2.4.2
[ 11.927025] NET: Registered PF_PPPOX protocol family
[ 11.938342] kmodloader: done loading kernel modules from /etc/modules.d/*
[ 12.753628] urngd: v1.0.2 started.
[ 19.146103] mtk_soc_eth 1e100000.ethernet eth0: Link is Down
[ 19.186912] mtk_soc_eth 1e100000.ethernet eth0: configuring for fixed/rgmii link mode
[ 19.195420] mtk_soc_eth 1e100000.ethernet eth0: Link is Up - 1Gbps/Full - flow control rx/tx
[ 19.212214] mt7530-mdio mdio-bus:1f lan2: configuring for phy/gmii link mode
[ 19.222083] br-lan: port 1(lan2) entered blocking state
[ 19.227428] br-lan: port 1(lan2) entered disabled state
[ 19.232963] mt7530-mdio mdio-bus:1f lan2: entered allmulticast mode
[ 19.239398] mtk_soc_eth 1e100000.ethernet eth0: entered allmulticast mode
[ 19.249888] mt7530-mdio mdio-bus:1f lan2: entered promiscuous mode
[ 19.282289] mt7530-mdio mdio-bus:1f lan3: configuring for phy/gmii link mode
[ 19.290568] br-lan: port 2(lan3) entered blocking state
[ 19.295853] br-lan: port 2(lan3) entered disabled state
[ 19.301330] mt7530-mdio mdio-bus:1f lan3: entered allmulticast mode
[ 19.310154] mt7530-mdio mdio-bus:1f lan3: entered promiscuous mode
[ 19.328475] mt7530-mdio mdio-bus:1f lan4: configuring for phy/gmii link mode
[ 19.337269] br-lan: port 3(lan4) entered blocking state
[ 19.342793] br-lan: port 3(lan4) entered disabled state
[ 19.348205] mt7530-mdio mdio-bus:1f lan4: entered allmulticast mode
[ 19.356589] mt7530-mdio mdio-bus:1f lan4: entered promiscuous mode
[ 19.376536] mt7530-mdio mdio-bus:1f lan5: configuring for phy/gmii link mode
[ 19.385606] br-lan: port 4(lan5) entered blocking state
[ 19.391074] br-lan: port 4(lan5) entered disabled state
[ 19.396418] mt7530-mdio mdio-bus:1f lan5: entered allmulticast mode
[ 19.405826] mt7530-mdio mdio-bus:1f lan5: entered promiscuous mode
[ 19.434374] mt7530-mdio mdio-bus:1f wan: configuring for phy/gmii link mode
[ 19.443665] br-wan: port 1(wan) entered blocking state
[ 19.449045] br-wan: port 1(wan) entered disabled state
[ 19.454379] mt7530-mdio mdio-bus:1f wan: entered allmulticast mode
[ 19.464064] mt7530-mdio mdio-bus:1f wan: entered promiscuous mode
[ 19.578670] mtk_soc_eth 1e100000.ethernet sfp: PHY [mdio-bus:07] driver [Qualcomm Atheros AR8031/AR8033] (irq=POLL)
[ 19.589361] mtk_soc_eth 1e100000.ethernet sfp: configuring for phy/rgmii-rxid link mode
[ 19.604583] br-wan: port 2(sfp) entered blocking state
[ 19.610005] br-wan: port 2(sfp) entered disabled state
[ 19.615304] mtk_soc_eth 1e100000.ethernet sfp: entered allmulticast mode
[ 19.623788] mtk_soc_eth 1e100000.ethernet sfp: entered promiscuous mode
[ 22.569577] mt7530-mdio mdio-bus:1f wan: Link is Up - 1Gbps/Full - flow control off
[ 22.569660] br-wan: port 1(wan) entered blocking state
[ 22.582423] br-wan: port 1(wan) entered forwarding state
I tried 9600 and 19200 also - no output and garbage as soon as openwrt boots which is to be expected.